Valve’s Anti-Cheat (VAC) is constantly updated to detect signature patterns of public "free" hacks. Even if the hack "works" for one match:

If you have already interacted with "CSGOHack v1.2.21.zip," take these steps immediately:

Here is why you should avoid this specific file and the risks associated with "free" game hacks. 1. It’s Likely a Password-Stealing Trojan

The Hidden Risks of "CSGOHack v1.2.21.zip": Why You Should Think Twice